Telegraph transmitter



July 5 9 1927. x 1,635,329

6. L. KRUM ET AL TELEGRAPH TRANSMITTER Original Filed Deb. 23, 1919 3 sheets -sheet 1 fY/UeVZZ Of'S/ C/Zcuies Z ECU/770', v lzfywmzi l. A5142, a fly wi h M v July 5 9 392K. x

C. L. KRUM ETAL TELEGRAPH TRANSMITTER Original Filed Dec. 23. 1 1 3 Sheets-Sheet 2 ill? 67222719 mm 0771 W 2 s.

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C/zaiie jfozuarci c. LfKRUM ET AL TELEGRAPH TRANSMITTER Original F'iled Dec. 23, 1919 July 5, 1927.

Parental July 5, 1927. '1

f UNIT D ATES PATENT CHARLES It. KBUM AND HOWARD I4. ISSUE, 01' CHICAGO,

ILLINOIS, ASSIGNOBB, .IBY

MESNE ASSIGNMENTS, TO HOBKRUM-KLEIN SCHMIDT CORPORATION, OF CHICAGO, ILLDTOIS, A. CORPORATION OF DELAWABE.

p rnnnema 'raansmmna.

Original application filed December 88, 1919, Serial No. 848,948. Divided and this application filed august: 24, 1928,

The invention relates to transmitters for printing or'selective telegraphs and seeks to provide an improved transmitter adapted for use. with start-stop tele aph systems,

5 that is'to say, a system in whichthe receiver is provided with a rotary member or distributor which is kept in proper phase relation with the transmitter by being stopped at the end of each signal and aga1n started at the begirining of the succeeding signal.

' The invention consists in features of 1mprovement hereinafter. set, forth, illustrated in the preferred form and arrangement 1n the accompanying drawings and more particularly pointed out in the appended clalms.

The resent a an app ication ed by us in the United States Patent Ofice December 23, 1919, Serial No. 346,948.

In the drawings: Figure 1 is a plan view of transmitter the improved Fig. 2 is a vertical section on the line 2-2 of Flg. 1 with the motor broken away; Fig. 3 is a detail section on the lines 3-3 ofF1gs.1and5; v

' Fig. 4 is a section on the llnes 4-4 of Figs.1and5;and. Figs. 5 and 6' are detail sections on the. lines 55 and 66 respectively of F1 1. V

' The improved transmitter. is mounte upon a base 1 and its rotary-member or distributor is driven by a motor 2. If desired, a receiver having a rotary distributor drlven by the motor 2 may-also be mounted u 11 base 1. For convenience in assembling t e small electric motor 2 is mounted upon a base 4 removably fixed to a plate 5 that is mounted upon the upper face of the base At 1ts inner end the motor shaft is provided with a fly wheel 6 and a suitable governor such as set forth in the application referred to is provided at the outer end of the motor shaft for maintaining the speed of the motor uniform, the governor being (provided with means which may be adjuste to obtain the desired'rate of speed for the motor.

The base 1 is a'hollo'w casting and has an extension 13 at its lower front portion. The transmitter. keyboard comprises finger keys 14. and aspace bar 15. The keys are carried upon the upturned forward ends of a set of 1plication is a division of hand ends with arms 29 that project up- Serial H0. 583,875. Benewed Hay 4, 1927.

levers 16 which are arranged within the upper portion of the base with their forward ends extending outwardly through an opening in the base and over the base extension 13. Front and rear comb bars 17 and 18 are provided for guiding the key levers and the atter-are connected to the rear comb bar by a common pivot rod 19. The space bar 15 is mounted on a bail 20 that is pivoted v on the upper face of the base extenslon and engages the downwardly ofl'set forward end of one of the key levers.

The characters are represented by permutations of two different line conditions extending through a definite number of time intervals or units. Preferably a five-interval or five-unit signal code is employed and the signals are represented by permutations '10 either of current and no current or of mitive and negative impulses exten in through the five intervals or units of ea signal.

To selectively determine the signals to be. 7% transmitted thekey levers are provided with depending fingers 21 wlfiph variably operate a set offive bars or bails 22"that extend transversely below the levers. An additional startingbar or bail 23 is rovided and is uniforml operated by all of the ke levers. These ails are pivoted on comb blocks 24 fixed in vpos1tion at'the "sides of .the base 1 and U-springs 25 normally uphold the key levers and bails with the key levers engaging a transverse sto portion 26 at the upper front portion of t e base, and with the 'bails engagin the fin era 21. These springs are rovi ed with fiooks at their upper ends w ich engage the key levers and the arms of the bails and the lower downturned ends of the sprin on go an opening in.a fixed transverse fir 2 The extent of depression of the key levers and bails is limited by a stop 28, fixed to the bar as I2)7 land projecting forwardly beneath the an s.

The bails 22 are provided at their rightwardly through an opening in the base 1 and are pivotedto'the rear ends of a set of five selecting members or fingers 30. The selecting fin ers extend forwardly through guiding note es formed in the upper portion I 1s mounted on a the form shown,

, upper e the beveled forward ends of t of a common transverse bar 31. Bar 31 referably forms part of the M1132, which ivot pin or shaft 33 The latter is mounted in rearwardly pro ect1ng arms orlugs 34 formedupon an upright bracket 35 that is fixed to the base 1 An upwardly extending arm 38 on the bailcarries aninsulated contact 37 that is arranged to engage an insulated ad'ustable contact 38 on the up er end of the racket 35. These contacts orm a transmitter switch and are preferably normally held in engagement by. a spring 39, which extends between the lower ortion of the' bracket and the dependin ug on the bail 32. v

A set'of five switch shifters is prov ded for operating the movable contact 37. In the switch shifters 40 are provided with U-shaped forward ends which pivotally engage the pm or shaft 33 and their rear ends extend through the guiding notches of the bar 31 and rest upon the forward ends of the selecting fingers- 30. At their rear ends the switch shifters are providedwith. beveled shoulders 41 on the r lower ed es and withraised lugs 42,0n their ges,'and these shoulders and lugs ectively by are arranged to be engaged r fingers 30 and by a set of five came 43 which are arranged in a helical series on a transmitter actuating shaft 44.

Shaft 44 is journaled in suitable bearings on the bracket parts 34 and is driven from the motor 2 through the medium of suitable connections controlled by a clutch. In the arrangement shown see Figs. 1, 2 and 6), the clutch is moun on a short horizontal shaft 45 which extends from front to rear of the machine and is journaled in two brackets 46 and 47 mounted on the base plate 5. A worm wheel 48 is mounted on the rear end of the clutch shaft and engages a worm 48' on the shaft 49 that is contmu-' ously driven, when the machine is in operation, by the motor 2. The forward end of the shaft 45 is connected by a pair of beveled gears 50 of equal size to the transmitter shaft 44, or preferably, as shown, to an intermediate shaft 51, which is journaled in l a projecting lug on the bracket 47. and in a bracket 52, on the base plate 5. The intermitter actuating shaft 44 and is connected thereto by preferably comprises two disks, 53 .and 54, adjustably fixe by set screws to the respectiveshafts, and one of which is provided with an eccentric pin 55 enga g anotch in the other disk. The worm s aft 48 is in line with the motor shaft and is connected thereto by .a' similar col iplling comprising two' disks 56.

. e transmitter clutch comprises driving and driven members 57 and 58 having conietachable e selecting mediate shaft 51 is in hne with the transg a detachable coupling whichgreferably' ing member are loose-on the shaft 45 and a yoke 59 fixed to the bracket 46, engages a oove in the hub of the worm wheel and ho ds it and the driving hclutch member against axial movement. member 58 is preferably formed of wood and is fixed to a flanged sleeve. 60 that is pinned to the clutch shaft 45. This shaft can shift in axial direction to a slight extent through its bearings '61 and 62 and through the hub of the gear 50 thereon.

The forward end of the'shaft is squared and engages a corresponding bore in the hub of the gear 50 to drive the latter. This axial movement of the shaft 45 serves to engage and disengage the clutch members. The driven clutch-member 58 is provided on its outer face with a cone 63 which is arranged to engage the internal face of an annular brake 64 that is carried on the bracket 47 by means of two pairs of screw pins 65 and 66.

The screws 65 extend loosely throu h openings in the bracket and are a justably threaded into the body of the brake 64. The

screws 66 are fixed to the bracket and the rear ends'thereof engage uiding o enings in the brake (see Fig. 1). prin 6 coiled about the screw pins 66 yielding y hold the brake in position with the heads on the outer ends of the screws 65 engaging the outer face of the bracket 47. By means of the screws 65 the position of the brake and the tension of the springs 67 can be adjusted.

A heavy spring 68 coiled about the forward and of the clutch shaft 45 extends between the flanged bearing 62 and the loose washer 69 which bears againstthe forward end of the fiariged sleeve 60. Preferably, anti-friction ro ers are interposed between the washer and the sleeve. This spring tends to shift the clutch shaft rearwardly and move the driven clutch member 58 thereon into operative engagement with the driving member 57. In the normal or zero arm or lever 70, in its forward position against the tension of the s ring 68 and with the cone 63 of the driven c utch member enaging the brake 64. The tri arm or lever 70 is pivoted at its upper en in a yoke 71 and its lower end engages a 'ding yoke 72, both of the yokes being fixe to and projectin rearwardly from the bracket 46. A r0 ler 73 journaled within an opening in the trip lever, engages the rear face of a cam disk 74 that is held by a set screw upon the rear end of the clutch'shaft 45 and which is provided with an eccentric lug 75 arranged to co-operatev with the roller 73. A

locking latch 76 is arranged to engage the cal working faces (see Fig. 6 drive driven clutch till) arm 80 thatdepends from the left-hand I normal before the shafts 44 mounted on the horizontal rock shaft 77. The latter is journaled in suitable bearing lugs on the base plate 5 and is provlded at its left-hand end with an arm 78 which extends downwardly through. an opening in the base and is connected by a link 7 9 to an P tion of the starting bar or bail 23.

In the normal or zero position of the trans mitter the latch 76 engages the lower end of the trip arm 70 and the roller 73 on the latter engages the cam lug 75 to thereby hold the shaft and clutch member 58 thereon forward with the spring 68 compressed and the cone 63 engaging any transmitter key is actuated, the start ng bar or bail 23 is depressed and latch 7 6 drawn down to release the trip arm. Spring 68 then serves to quickly engage theclutch members and the transmitter actuating-shaft 44 is driven in'the direction indicated by the arrows in Figs. 2 and 3. As soon as the cam lug75 clears the roller 73, a light spring 81 see Fig. 6) draws the trip arm forward so t at it is re-engaged by the latch 76 as soon as the shifted .key is restored to normal. The shifted key' will usually be restored to asingle revolution. Then, since the trip arm is locked by the latch 76, the engagement of the cam lug 75 with the .roller 73 will shift the shaft 45 forwardly and move the clutch member 58 thereon out of engagement with the driving member 57 and into engagement with the brake .64, so that the shafts44 and 45 are arrested with the flat rearend of the cam lug 75 engaging the roller. This disengagement of the clutch is aided by the momentum of the movin parts and the preferred clutch and brake construction set forth acts efiiciently to effeet the quick starting and stopping of the lugs transmitter actuating shaft.

- As shaft 44 rotates, the came 43 thereon move in succession over the rear ends of the corresponding switch shifters 40. The lugs 42 on the latter are, however, normally out of the path of movement of the cams 43, but when a key is depressed, one or more of the controlling fingers or selectors 30 are moved forward and lift the rear ends of the corresponding switch shifters so that the 42 thereon are en aged by. the corresponding cams 43 as s aft 44 rotates, and t is operation of the cam lugs will depress the rear ends of the switch shifters, the forward ends of the selecting fingers, an-dthe common transverse bar 31 of the bail 32 to thereby open the transmitter switch contacts 37 and 38. Shaft 44 is also provided with an additional starting cam 82, which is disposed in advance of the cams 43 and isv arranged to engage a lug 83 fixed to the bar 31. Unlike the lugs 42 o the switch shifters,

the brake 64. When and 45 complete each and is engaged thereby during the initial I portion 0 each revolution of shaft 44 to shift the transmitter switch contact 37.

. The cams 43 and 82 are 84 and a nut 85,

leaving one space unoccupied. The vacantspace or gap of the cam supporting member, in the zero position of the transmitter shaft, lies above the lugs 42 of the switch shifters and the lug 83 on the bar 31. At each revolution of the shaft, cam 82, as stated, engages the lug 83 to impart an initial or starting impulse to the line. Cams 43. then pass in succession over the rear ends'of the switch shifters 40 and during the interval that each cam passes over the lug 42 of the corresponding switch shifter, the transmitter switch contacts are either opened or closed in accordance as to whether or not the rear end of the switch shifter has been raised by the corresponding eontrollin finger 30. A starting pulse -or interva followed by a permutation of two different line conditions extendingthrough five time intervalsor units and representing a character signal, is thus imparted to the line at revolution of thetransmitter shaft. As shown, the vided with concentric outer edges and beveled ends, and the beveled ends of adjacent cams terminate in alignment, as most clearly shown in Fig. 3. The lugs 83 and g 42, which cooperate with the cams, are correspondingly beveled and the arrangement is. such that the starting pulse or interval and the five intervals or pulses of the selective signal code are of uniform length. Also, with this arrangement, two like pulses or, line conditions will follow each other with them. I

Means are provided for locking the shifted keys and holding the other keys against operation. For .thispurpose a lock bar 86 extends transversely below the key levers 16 and is provided with a beveled rear edge arranged to co-operate with beveled lugs 87 formed upon the fingers 21 of the key levers. The lock bar is attached to the lower ends of two rock arms 88 which extend upwardly through openings in the base 1, one being pivoted to a lug on the bracket 35 and the other to a bracket 89 on the base. The righthand arm 88 is provided with an upwardly no gaps or spacing intervals between preferably formed upon separate disks held in place on the and'rearwardly inclined extension and carthe cam 53 and 90 drops into the recess of The controlling the projection 94 keylever in actuated position and the other key levers against movement.- Preferably lock barji86 are arranged to (so-operate" with the beveled lu 87 of the selected key to. complete its shift. I

,At or beforethe end of one revolution of the transmitter actuating shaft 44 the roller the cam 53 and the shifted keyand parts controlled thereby are restored to normal in readiness for the transmission of the succeeding si 'nal. Preferably, in order to permit rapi operation of the transmitter keyboard, the recess of cam 53 is of such length that the keys are unlocked and restored to normal during the transmission of the third or fourth interval or pulse of each signal, but this necessitates the use of some means for storing the last or the last two impulse selections. In the formshown, the cam recess is of such length that the keys and signal selecting bails or bars are released and restored to normal during the transmission of the fourth pulse of each signal, and means most clearly shown in Fi 4, are provide in connection with the fifth impulse controlling finger for permitting the operation of a key during the transmission of the fifth pulse.

The arm 29 of the fifth bail is cut off and is provided with an upwardly extending spring arm 92 tothe upper end of which the corresponding controlling finger 30 is ivoted. The latter extends rearwardly 0 its a light spring .93 extends berear end and the arm 29. finger 30' is provided near its forward end an on its lower edge with a shortlug 94, which normally lies in rear of the bar 31. The fifth impulse cam 42 as pivot and tween its shown is provided with an extension 95of the same length as the other cams but of less height and arranged in line with the fourthimpulse cam. When a key which selects the fifth bar or bail 23 is depressed on the corresponding controlling finger 30' will strike against the bar 31, so that the controller cannot be shifted to lift the corresponding switch shifter and the spring arm 92 will be fle'xed as shown in full lines in Fig. 4. The depression of the key will also, of course, close the transmitter clutch and start the rotation of the shaft 44 and cam 53, thereon, and the latter will shift the locking bar and hold the selected key down, as also indicated in Fig.

the lug 83, the spring position of the trans-- bar'86 is held out As 'lines in Fig.- key is depressed, however, the

' at the proper time,

its action cannot open the contact.

- controlling 4. Then, when the-bar 31 is depressed b the engagement of the starting cam 82 wit 93- can then slightly lift the forward end of the controller 30' so that the flexed spring arm 92 will shift it forward to 4, and thereby raise the fifth Impulse switch shifter 40. In this position the lug 94 will be in front of the bar 31' and, the fifth im ulse cam 42 will engage and actuate the I ifth impulse switchshifter.

the position indicated in dotted I The locking bar releases theshifted key as soon as the fourth impulse has been transmitted, but the fifth impulse controller 30' is prevented from moving back to normal position-in case the bar 31 is depressed by the fourth impulse cam-by the extension 95 of the fifth 1m ulsecam. This extension holds the contro ler 30 sufficiently down ward to prevent its projection 94 from clearing the bar 31. As sprin 93 is much lighter than the spring 39, of .t e rocking bail 32,

fifth bar or bail 23 has been selected for a letter, the controlling finger 30. remains in its shift'ed left-hand position at the comple tion of the transmission of'the character signal, and the spring arm 92 will be flexed 1n the opposlte direction from that indicated in Fig. 4. If the fifth bar or bail is If the.

selected for the succeeding character, the

finger 30 remains in shifted position; but, if it is not selected it will slip back over the bar 31 when the starting cam 82 moves the bar downwardly; If desired, similar storing means could be associated with the fourth impulse selecting devices. This arrangement for storing the fifth .impulse selections of the code signals permits of the rapid-operation of the transmitter in sending a message, and, indeed, without arresting the transmitter shaft, since the keys can be operated so rapidly that before the transmitter and clutc shafts M and 45 have completed a revolution the latch76 and the trip arm 70 will not act to open will have been shifted-to released position the clutch. Nevertheless, as the cams 82 and 43 andthe spacing portion of the cam member on the shaft 44passin succession over the lug 83 and the lugs 42 of the switch shifters, the codesignals each preceded by a starting to the line and will be separated by spacing intervals substantially equal in length to the starting and selecting intervals and during which the line is restored to normal closed condition. Of course, during pauses in the operation of the finger keys, or at the end pulse will be properly imparted of the transmission of a message, the latch 7 6 and trip arm 70 will act as described to arrest the transmitter in zero position, ready for furtheroperation.

It should be noted that the improved transmitter isoperated solely under local control. That is to say, it is started and sto ped independently of the line impulses and does not apply the starting impulses to 5 the line until after it leaves or moves through its normal or zero position. ln this way the timing of the impulses or intervals of the signals, including the starting interval, is controlled solely by the movement of the rotary transmitter member duringeach signal period. Therotary member or distributor of any receiver'responsive to the line impulses is preferably set to rotate at an.an-"

gular speed slightly greater than that of the 5 transmitter member so that it will be invariably arrested at.the endof each signal and again started in proper phase relation to the signal intervals by the starting interval of the succeeding signal. vSince the transmitter applies the starting intervals for the line after it leaves or moves through its zero position it is not necessary to adjust the receivers to take care of any variation in the starting lag of the transmitter.

5 It is also noted that the improved transmitter employs mechanically actuated vibratory transmittin contact means which is less subject to de ective operation on account of 'wcar than is the case with an elec- 0 trical distributor or sunflower.

Changes may be made and the details set forth varied without departing from the scope of the appended claims.

We claim as our invention 5 1. In a signalling apparatus, transmitter switch contacts, a set of selectors, a rotary cam member having a series of successively operative sections foretfecting the operation of said contacts variably in accordance with the setting of said selectors and thereby transmit a corresponding succession of impulses,

. a power-driven start and stop clutch for rotating said cam member, a key board and solely mechanical means actuated by said keyboard for setting said selectors and tripping said clutch.

2. In a signalling apparatus, transmitter contacts, a set of selectors, a rotary cam member having a series of successively operative sections for effecting the operation of said contacts to transmit uniform starting impulse followed by a series of selecting impulses varied in accordance with the setting of said selectors, a power driven start and stop clutch for rotating said cam member,

and meansin'dependent of said transmitter contacts for tripping said clutch and setting said selectors.

In a signalling apparatus,ftransmitter switch contacts, a set of selectors, a rotary cam member having a series of successively operative sections for effecting the operation of'said contacts variably in'accordance with the setting of said selectors, a start and stop clutch comprising a power actuated driving member, a brake, and a 'driveh member connected to said cam member and axially shiftable to altcrnatel engage said driving memher and said bra 'c, a trip for shifting said driven member into brake, a latch for said trip and a keyboard lfor lsetting said selectors and releasingsaid atc 1.

4. In a signalling apparatus, contacts for controlling all transmitted impulses, a set of shifters therefor, a set of selectors for controlling said shifters, a rotary cam shaft havinga series of successively o erative sectrons or variably actuating sai shifters in accordance with the setting of saidselectors, apower driven start and stop clutch for continuously advancin and timing the operation of said cam s aft during each signal period, a keyboard and, means operated thereby independently of said transmitter contacts for tri ping said clutch and for operating said seictors.

5. In a. signallin atpparatus, transmittin contacts, a set of s i ters therefor, a set 0 selectors for controlling said shifters, a. ro-

.tary cam shaft variabl actuating said shifters in accordance wit the setting of said selectors, a power driven start and stop clutch for rotating and timing the o ration of said cam shaft during each signa period, a key board for tripping said clutch and operatmg said selectors, a lock for said keyboard controlled by said cam shaft and arranged to release said keyboard before the end of the signal period, yielding connections between of said selectors, and means controlled by said cam member for temporarily holding such selectors either in the shifted or retracted position.

6. In an electric signalling apparatus, a transmitter contact, a set of shifters therefor, a set of selectors for variably positioning said shifters, a power driven rotary cam shaft having a starting cam for uniformly operating said contact at the beginning of each signal and a set of cams for variably operating said contact shifters in accordance with the setting of" said selectors, said cams being arranged in succession about said shaft with a spacing gap between the terminal cams of the series, means to start said cam shaft at the beginning of each signal and stop the same with said spacin gap in operative position at the end of one signal, and a keyboard for controlling said startmg and stopping means and for setting said se ectors. i u

7. In an electric signalling apparatus a transmitter contact, a set of shifters therefor, a set of selectors for variably positioning said shifters, a power-driven rotary cam said keyboard and one or more shaft having a starting cam for uniformly 'eration of. said cam shaft at the I and end, respectively,

operatingl said"contact shifters in accordance wit the setting of said selectors said cams being arranged 1n succession about said shaft with a spacing gap between the terminal cams of the series, a start and stop clutch for initiating and arresting the opeginning of each signal, and a keyboard mechanism controlling said clutch and setting said selectors, said keyboard mechanism being arranged to effect the continuous operation of said cam shaft.

8. In a signalling apparatus, transmitter switch contacts, a power driven rotary cam member having contact operating sections arranged in series about said shaft with a spacin gap between them and brought in order into operative position as said member is rotated, a set of members for selec- Y arranged in ditions,

tively controlling the operation of said cam sections upon said contacts, means for starting and sto ping said cam shaft at the be-- ginning an end respectively of each signal, and controllin means for said startin means and sai selecting members arrange to effect the continuous operation of said member.

9. In a signalling apparatus, transmitter switchcontacts, a power driven rotary cam member having contact operating sections arranged in series about said shaft with a spacing gap between them and brought in order into operative positionas said member is rotated, a set of members for selectively controlling the operation of said cam sections u on said contacts, a clutch for starting an stopping said cam shaft at the be ginning and end respectively of each signal, a keyboard for controlling said clutch and for setting said selectin members, and a lock bar on said ke boar controlled by said cam shaft arranged to permit the continuous operation of said cam member. y

10. In a signalling apparatus, transmitter switch contacts, a power driven rotary cam member having contact operating sections series about said spacin gap between them and brought in order 1nto operative position as said member is rotated, a set of members for selectively controlling the operation of said cam? sections upon said contacts, means for starting and sto ping said cam shaft at the beginnin an end respectively of each signal, a key oard for controlling said starting means and setting said selectin members, and a locli bar for said keyboar controlled b said cam shaft and arranged to release t e same before the completion of the signal period to thereby permit the continuous operation of said cam member.

11. In a telegraph transmitter, a rotary cam member, transmitting switch contacts operated thereby for'controlling all line c'onsaid cam member having" a series of shaft with a maniac sections brought successively and one at a time into operative position as the member is rotated and including uniformly acting starting and spacingsections at the ends of the series, a set of selectors variably controlling the operation of the intermediate sections, a motor driven start and stop clutch for continuously advancing said cam memlin the operation of said clutch and of till line conditions, said cam member comprising 7 a series of sections acting successively and one at a time as said cam member is rotated and including uniformly acting, starting and spacing cam sections at the ends of the series respectively controlling'the opening and closing of the contacts, a set of selectors variably controlling the operation of the intermediate cam sections, a stop device for arresting said cam member with the spacing section in operative position, means for tripping said device and for variably controlling said selectors;

13. In a telegraph transmitter, transmit.- ting contacts, a set of shifters therefor, a set of selectors, a. power driven rotary cam member having a series of successively acting cam sections co-operating with said shifters to uniformly operate said contacts at the beginning of each signal period, thereafter, undercmitrol of said selectors, to variably operate the same and linally to restore said contacts to normal condition at the end of each signal period, means for arresting said cam member with said restoring or spacing cam section in operative position, and means independent of said transmitting contacts for releasing said arresting nmans and for setting said selectors.

14. In combination with a telegraph transmitter, transmitting contacts, a set of selectors, a power-operated rotary cam memher having a series of angularly spaced sections brought successively into operative position as said cam mcmberis rotated and including a starting section for uniformly operating the contacts at the beginning of each signal period and a series of cam secti ons cooperating with said selectors to there after variably operate the contacts, a sto device for arresting said cam member witii said starting cam section in inoperative position, and means operative independently of said transmitter contacts .for setting said selectors and releasing said stop device.

15. Incombination with a telegraph transmitter, a motor-driven rotary cam member, transmitter contacts holding the line closed in a normal rest position of said cam memill] her and operated by the rotary movement the position, and means for variably thereof to impulses, said member having a series of sections acting successively and one at a time as the member is rotated and including starting and spacing'sections uniformly acting at the beginnin each operation of the' cam member, a set of selectors for variably controlling the operation of the other main sections, a stop devicefor arresting said cam member with the spacing section thereof in operative position and with other of said sections in inoperaoperating said selectors and for releasing sai stop device.

16. In a transmitting apparatus for startstop telegraph systems, vlbratory transmitting contact means normally holding the line closed, a set of controlling selectors therefor, a start-stop actuating member adapted by its movement from a normal rest position and during each signal period, to position said vibratory contact means and thereby establish a starting line condition followed by a definite interval-permutation of selecting conditions in accordance with the setting of said selectors, and means for mechanically starting and stopping said actuating member and for conditioning said selectors.

17. In a transmitting apparatus for startstop telegraph systems, a single vibratory transmittlng contact, a set of impulse selectors and a start-stop actuating member adapted by its movement from a nprmal position and durin each si al period,to change the position of sa1d contact and thereby establish a starting line condition followed by a definite interval permutation -of selecting conditions in accordance with b the condition of said selectors. 7

18. In a transmitter for start-stop telegraphs, vibratory transmitting contact means, a rotatable actuating member therefor movable successively through a series of positions to thereby condition said vibratory contact means'during a corresponding serics of successive time intervals including starting and selecting intervals of substantially uniform length and a final spacin interval of at least equal length, a set 0 selectors for variably determining the line conditions during the selecting intervals, and controlling means for said actuating member operable to arrest and again start.

the movement ing intervals.

19. In a transmitter for start-stop telegraphs, vibratory transmitting contact means, a rotatable actuating member therefor movable successively through a series of positions to thereby condition said vibratory thereof only during the spaccontact means 'durmga corresponding series of successive time intervals 1nclud1ng start-' (t me .I.

thereby control all transmitted jandend respectively of member only mg and selecting intervals,

ing and selecting intervals of substantially uniform length and a'final spacing interval I of at leastequal len said actuator invaria l tact means in two I ing the starting and slpacing intervals -'re-' spectively, and variab y conditionin the ,a set of selectors, placin said consame during the selecting intervals in ac-[ different con 'tions durcordance with the condition of said selectors,

and controlling means operable to arrestand again start the movement of said actuating during the spacing intervals and for variably conditioning said selectors.

20. In a transmitter for start-stop telegraphs, vibratory transmitting contact means, a rotatable actuating membertherefor movable successively through a series of positions to thereby condition said vibratory contact means durlng a corresponding series of successive time intervals including starting and selecting intervals of substantially uniform length and a final spacing interval of at least equal length, a set of selectors for variably determinin the line conditions during the selecting intervals, 9. motor and interposed clutch for continuously advancing said actuating member during the starta cooperating stop device operable to arrest said member only during the s acing intervals, and all mechanical contro ling means, including a keyboard, for releasing said stop device and for conditioning said selectors in 'dilferent combinations.

21. In a transmitter for start-stop tele-' graphs, a'set of selectors,

a single transmittlng contact, an actuating member therefor movable successively through a series of ating member movable successively through a series of off-normal positions and a normal position during corresponding'starting, selecting and spacing time intervals to thereby invariably place said vibratory contact means in two dilferent conditions during the starting and spacing intervals respectively and variably position the same during the selecting intervals in accordance with the condition of said selectors, means'for conditioning said selectors, and actuatin and controlling means operable to stop saidactuating member in normal position andto start the same therefrom and adapted to efi'ect the the end of each signal, and all mechanical means for starting and stopping said actuating member and for conditioning said' selectors. r

24. In a transmitter forstart-stop telegraphs employing a definite interval signal, a single vi set of mechanical controlling selectors therea rotatable actuating member having a normal position for holding the contact closed and adapted by its rotary movement from a'normal position during each signal period to invariably open said contact during the starting interval of the corresponding signal, thereafter cooperate with said selectors to variably open and close the contact during the selecting intervals, and finally restore the same to normal closed. condition at the end of each signal, a plurality of key levers for conditioning asid selectors, and means controlled by said keylevers and operable independently of said contact for initiating the rotation ofsaid actuating member. "'25. In'a transmitter for start-stop telegraph systems, a set of selecting elements, a rotary actuating member, vibratory contact means positioned and timed in operation by the rotary movementof said member during each signal eriod to thereby initially open the line and thereafter variably open and close the line in accordance with the condition of said selectors and finally to restore the line to normal closed condition at the end of each signal, and all mechanical controlling means for conditioning said selectors and for initiating and arresting the operation of said rotary actuating member. '26. In a transmitter for start-stop telegraplis employing definite interval code signals, vibratory transmitting contact means normally holding the line closed, a set of controlling selectors therefor, a start-stop, rotary actuating member movable from a normal position and duringeach signal period to thereby uniformly position said contact means during the. start interval of the corresponding signal and thereafter variably position the same in accordance a series of selecting impulses in' bratory transmitting contact, a

'with the condition of said selectorisiand to restore said contact means to normal closed condition .for at least a definite interval at the end of each signal,.and controlling means for conditionin said selectors and for arresting and againinitiating the operation of said rotary actuating" member between signal periods. a

27. In a transmitter for start-stop telegraphs, a single transmitting contact, aset of controlling selectors and a rotary actuating member therefor, a motor and an interposed clutchfor continuously advancing said member during each-signal period to thereby uniformly position said contact in an off-normal position during a starting interval and thereafter variably position the same in accordance with the condition of said selectors and to restore said contact to normal at the end of each signal, and means for conditioning said selectors in different combinations and for controlling the operation of said clutch.

.28. In a transmitter for start-stop telegraphs, a single transmitting contact, a set of controlling selectors and a rotary actuating member therefor, a motor and an inter posed 'clut'ch for continuously advancing said member during each signal period to thereby uniformly position said contact in an cit-normal "position during a starting interval and thereafter variably position the same in accordance with the condition ofsaid selectors and to restore said contact to normal at the endof each signal, a stop device for arresting said rotary actuating member at the end of any signal period, and

a plurality .of key levers for conditioning said selectors and for simultaneously and mechanically releasing said stop device.

29. In a transmitter for start-stop telegraph systems employing definite interval code signals, vibratory transmitting contact means normally holding the line closed, a rotary cam member having a series of sections acting successively, as said member is rotated, to position said contact means dur ing a corresponding vseries of successive time intervals including starting and selecting time intervals of substantially uniform length and spacing intervals of at-least equal length, a set of selectors for modifying the line conditions during the selecting intervals, and start-stop operating and controlling means for. said member arranged to arrest the same with the spacing section thereof in operating position and with the line in normal c'losedjconditiom 30. 111 a transmitter for start-stop telegraph systems employing definite interval code signals, vibratory transmitting contact means normally holding the line closed, a rotary cam member having. a series of sections acting successively, as said member'is rotated, to position said contact means durand controlling means cam member having a series of sections successivel acting, as said member is rotated, to position said contact, during a corresponding series of successive time intervals including starting and-selecting intervals of uniform length and spacing intervals of at least equal length, the starting and spacing sections of said cam member invariably acting to place said contact in .two different conditions, and the other cam sections variably conditioning the same under control of said selectors, and start-stop actuating and controlling means for arresting said cam member with the spacing cam section thereof in operative position.

32. In a transmitter for start-stop telegraphs, a single vibratory transmitting contact, a set of controlling selectors, a rotary start-stop canr member having a series of sections successively acting, as said member is rotated from a normal position during each signal period, to initially open said contact, thereafter variably open and close the same in accordance with the condition of said selectors, and finally restore said contact to a normal closed condition, means for continuously advancing said cam member during each signal period and all mechanical means for conditioning said selectors and. for initiating and arresting the movement of said actuating member.

33. In a transmitter for start-stop telegraph systems, vibratory transmitting contact means, va. start-stop rotary actuating cam therefor having a series of successively acting sections including invariably acting starting and spacing cam sections at the beginning and end of the series, a set of selectors controlling the operation of theintermediate cam sections, the starting and intermediate sections being of substantially uniform length and the spacing section of at least ual length, a 'motor and an interposed c utch for operatin said cam member or arresting said cam member with the spacing section in operative position, said controlling means arranged to permit the continuous rotation of said member during successive signal periods. I v

34. In a transmitter for start-stop telegraph systems, vibratory transmitting contact means, a start-stop rotary actuating cam therefor havinga series of successively acting sections including invariably acting starting and spacing cam sections at the beginning and end of the series, a set of se-' lectors cont-rolling the operation of the intermediate cam sections, the starting and intermediate sections being of substantially uniform length and the spacing section of at least equal length, a motor and an interposed clutch for continuously advancing said cam member during each signal period, a cooperating stop device for arresting the member with the spacing section thereof in operative position and means for mechanical- ]y conditioning said stop device.

35. In a transmitter for telegraphs, a startstop rotatable cam member, a set of mechanical elements selectable in different combinations, and a sin le transmitting contact invariably shifte from normal position during each signal period by the rotary movement of said cam member from its normal rest osition and thereafter variably operated y the conjoint action of said member and said elements.

36. In a transmitter for telegraph systems employing definate interval code signals, transmitting contacts, a set of actuating shifters therefor corresponding to the selecting intervals of the signals, a corresponding said selectors and releasing set of selectors for moving said shifters either to operative or inoperative condition, a rotarycam member for effecting the contact actuating movements of the shifters in operative condition, a motor and an interposed clutch for continuously and uniformly advancing said cam member durin each signal period and means for controlling the operation of said clutch and of said selectors. 37 In a transmitter for telegraph systems, vibratory transmitting contact means, a set of mechanically acting shifters therefor, a rotary cam member for effecting the contact operatin movement of said shifters one at a time, an means for selectively placin each of said shifters either into or out o position to be operated by said cam member.

CHARLES L. KRUM. nowann L. m. 

